[Coloradocobra]

The gauge I have only supports one O2 sensor. I suppose a switch could be used but that makes driving a little difficult. For ultimate tuning, two sensors should probably be used as it is possible to end up with slight differences from side to side, which is especially important if you are running towards the lean side. A fellow in Denver with a pretty radical GT-350 runs two gauges in his car. For now, I think I'll stay a little on the rich side while monitoring only the left bank to have a margin of safety on the right side. I may weld in a bung on the right side in the future just to compare.

I was surprised how constant the fuel ratio was across the rpm range running from 40 to about 80 in third gear. With more rapid acceleration you can actually see a temporary lean condition until the power valve opens and then the mixture returns close to the original value. Full measurement with the secondaries is a little tough because I build up speed a little too rapidly for legal limits.

I had this Holley custom built to match my engine and aside from some float/needle and seat issues with our goofy fuel at this altitude, it runs MUCH better than the 3310 I used to have on it.

The arguments between Demon and Holley will continue but I think ultimately none of them are "perfect" out of the box and they require fine tuning. As long as the gaskets are good and the bowls are tight I can't see how a Holley would drift any more than a Demon but then when you add in sun spots and phases of the moon, anything can happen.